Can't install to an external drive (only happens with this pkg)

```[twig@twig-tobefilledbyoem ~]$ sudo flatpak install com.spotify.Client
[sudo] password for twig:
Looking for matches…
Remotes found with refs similar to ‘com.spotify.Client’:

1) ‘flathub’ (system)
2) ‘flathub’ (system (extra))

Which do you want to use (0 to abort)? [0-2]: 2

com.spotify.Client permissions:
ipc network pulseaudio x11 dri file access [1]
dbus access [2] bus ownership [3] tags [4]

[1] xdg-music:ro, xdg-pictures:ro
[2] org.gnome.SessionManager, org.gnome.SettingsDaemon.MediaKeys, org.kde.StatusNotifierWatcher
[3] org.mpris.MediaPlayer2.spotify
[4] proprietary

ID Branch Op Remote Download
1. [/] com.spotify.Client stable i flathub 193,8 MB / 203,4 MB

ID Branch Op Remote Download
1. [✗] com.spotify.Client stable i flathub 193,8 MB / 203,4 MB

Error: While trying to apply extra data: apply_extra script failed, exit status 256
error: Failed to install com.spotify.Client: While trying to apply extra data: apply_extra script failed, exit status 256
[twig@twig-tobefilledbyoem ~]$ ```